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re: OT Geniuses, How would you answer this BlackRock interview question?

Posted on 7/14/24 at 8:09 am to
Posted by Ingeniero
Baton Rouge
Member since Dec 2013
20201 posts
Posted on 7/14/24 at 8:09 am to
I saw a really clever answer to this on Reddit:

quote:

"I will shoot the first person to attempt an escape" isn't going to work, because if they all attempt an escape at the same time, each prisoner has a chance of only 1/100 to get shot.

The trick is to give every prisoner a number from 1 to 100, and make sure each prisoner knows what their own number is, and to the whole group, announce that if any escape attempt is made, the prisoner with the lowest number gets shot.

Prisoner number one will never join an escape attempt. He knows it will be his death 100% of the time.
Prisoner number two knows that prisoner one will never join the escape attempt. That means prisoner two is not going to join either, because since prisoner one won't join, he'll be the one who gets shot in the event of a mass breakout.
Prisoner three knows this, and comes to the same conclusion. In fact, this logic works all the way up the chain of prisoners until number 100, who, knowing nobody else is going to throw away their life for him, isn't going to make this attempt either.

It's a pretty neat example of proof by induction.

Posted by SlowFlowPro
Simple Solutions to Complex Probs
Member since Jan 2004
450736 posts
Posted on 7/14/24 at 8:17 am to
quote:

Prisoner number one will never join an escape attempt. He knows it will be his death 100% of the time.
Prisoner number two knows that prisoner one will never join the escape attempt. That means prisoner two is not going to join either,

Prisoner 100 knows that he is under no danger to get shot, and if he tries to escape, prisoner 1 will pay the price.

I mean every prison other than 1 will have the same thoughts.
Posted by RummelTiger
Texas
Member since Aug 2004
91984 posts
Posted on 7/14/24 at 8:20 am to
Show them you're batshit crazy. Walk up and shoot the first one you see right between the eyes in front of them all.

It's a field of 100 murderers, so nobody is gonna give a shite you went rogue.
Posted by Ingeniero
Baton Rouge
Member since Dec 2013
20201 posts
Posted on 7/14/24 at 10:08 am to
quote:

Prisoner 100 knows that he is under no danger to get shot, and if he tries to escape, prisoner 1 will pay the price.

I mean every prison other than 1 will have the same thoughts.


Re-read the proof of the one I posted. It's not the same as the ones previously posted in the thread. If the lowest number prisoner will always be shot, then Prisoner 1 will never join an escape because he'll be killed. If Prisoner 1 will never join an escape, Prisoner 2 will never either because he's sure to be the lowest numbered prisoner. And so on until you get to 100. Prisoner 100 knows that the 99 prisoners before him will never join an escape because of the previous explanation, so he'd have to escape by himself, making him the lowest number. Again, this is assuming all prisoners are rational and understand the logic.
Posted by Gravitiger
Member since Jun 2011
11510 posts
Posted on 7/14/24 at 12:48 pm to
quote:

If the lowest number prisoner will always be shot, then Prisoner 1 will never join an escape because he'll be killed.
Unless he thinks he can successfully escape, in which case Prisoner 2 (as the lowest remaining number) would be killed.
Posted by lostinbr
Baton Rouge, LA
Member since Oct 2017
11704 posts
Posted on 7/14/24 at 12:49 pm to
quote:

"I will shoot the first person to attempt an escape" isn't going to work, because if they all attempt an escape at the same time, each prisoner has a chance of only 1/100 to get shot.

The trick is to give every prisoner a number from 1 to 100, and make sure each prisoner knows what their own number is, and to the whole group, announce that if any escape attempt is made, the prisoner with the lowest number gets shot.

Prisoner number one will never join an escape attempt. He knows it will be his death 100% of the time.
Prisoner number two knows that prisoner one will never join the escape attempt. That means prisoner two is not going to join either, because since prisoner one won't join, he'll be the one who gets shot in the event of a mass breakout.
Prisoner three knows this, and comes to the same conclusion. In fact, this logic works all the way up the chain of prisoners until number 100, who, knowing nobody else is going to throw away their life for him, isn't going to make this attempt either.

It's a pretty neat example of proof by induction.

That is indeed a good answer, but it seems to leave out a key detail - the prisoner with the lowest number who participated in the escape attempt is the one who will be shot.
Posted by Koach K
Member since Nov 2016
4569 posts
Posted on 7/14/24 at 12:53 pm to
I call bullshite on this question.

Obvious answer is commit bank fraud and promise to share and then abscond while pointing your finger at the murderers.
This post was edited on 7/14/24 at 3:17 pm
Posted by DavidTheGnome
Monroe
Member since Apr 2015
30472 posts
Posted on 7/14/24 at 12:59 pm to
Let them all murder each other and then shoot the last one standing with your bullet. The probability and age factors aren’t relevant and I think throw in there to throw you off


Edit: reread it, just saythe first to try to escape gets shot. Then no one will try to escape because if they're the first they have a zero probability of survival thus not try to escape. When 100 people won't go if they're first you never get a first and they all stay put
This post was edited on 7/14/24 at 6:41 pm
Posted by Master of Sinanju
Member since Feb 2012
11638 posts
Posted on 7/14/24 at 2:57 pm to
This is not a real life scenario. It is a simple logic problem. All you have to do is make sure the first escapee's odds of surviving is zero. Then it will be impossible for anyone to escape because no one will be able to be "first."
Posted by G The Tiger Fan
Member since Apr 2015
110053 posts
Posted on 7/14/24 at 3:21 pm to
quote:

I’d leave. Not smart enough for that crap.
Good thing I read the replies before posting. Beat me to it.
Posted by JackieSonnier
South Crowley
Member since Nov 2023
264 posts
Posted on 7/14/24 at 5:27 pm to
offer to buy the field they are in then build a DSLD subdivision. Sell each one of them a house…. they will never escape or recover from that.
Posted by N2cars
Member since Feb 2008
34117 posts
Posted on 7/14/24 at 6:11 pm to
This is fake.
Posted by Jcorye1
Tom Brady = GoAT
Member since Dec 2007
74935 posts
Posted on 7/14/24 at 6:29 pm to
It doesn't answer the biggest question, do they know you only have one bullet?
Posted by theCAW
Polk County
Member since Dec 2023
4148 posts
Posted on 7/14/24 at 6:42 pm to
I would tell the prisoners that I’m assigning the group with 100 DEI certificated female bodyguards who used to work for the SS and Pepsi
Posted by Narax
Member since Jan 2023
2741 posts
Posted on 7/14/24 at 6:47 pm to
They don't know you only have one round.

Tell them you have deputies in the woods watching them and if they run, they will all be killed.

And if anyone gets away you are going to shoot everyone else.
Posted by glassart
Member since Apr 2021
569 posts
Posted on 7/15/24 at 4:23 am to
1) Fulfill the parameters of the mission.
2) Live to collect payment.

100 dead murderers and no witnesses. It’s my word against theirs. Who can stop the savages when they turn on each other?
Posted by jizzle6609
Houston
Member since Jul 2009
14228 posts
Posted on 7/15/24 at 6:42 am to
Honestly?

I’d ask what state we are in to begin with.

Then I’d ask who gave a person of lower education a rifle with 1 bullet.

I’d then have that person shot with the 1 bullet in front of the murderers.

Posted by jizzle6609
Houston
Member since Jul 2009
14228 posts
Posted on 7/15/24 at 6:45 am to
So literally no leaders and all cowards is the Reddit answer? Probably right but very disheartening.
Posted by tigeraddict
Baton Rouge
Member since Mar 2007
13279 posts
Posted on 7/15/24 at 7:19 am to
Scene from saving private ryan.

“Who is your leader…” shoots leader
Posted by tigeraddict
Baton Rouge
Member since Mar 2007
13279 posts
Posted on 7/15/24 at 7:21 am to
quote:

Prisoner 100 knows that he is under no danger to get shot, and if he tries to escape, prisoner 1 will pay the price. I mean every prison other than 1 will have the same thoughts.


In this case you tell every prisoner they are number 1…..
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